DE2209938C3 - - Google Patents

Description

£ ^ etXai ::::

3 station according to claim 1 or 2, characterized _{p ne} , _na kSt. that at all bearing points of the pump <W n it is known (

_{to carry} out chaste construction

ger (126) are provided

_Leaving from D.chtungs- and respiratory column

surface of the smooth and preferably round or oval shape and closed by means of a lid Kessel (102) is designed to be corrosion-resistant for direct installation on the ground and that on d Cover of the boiler with ducts for cables (107) and those leading to the oil cooler Lines (112) provided cover open ζUs. into the terminal devices of the transformer (103) designed for plug connections

^ Sation nachAnspruch ^ adurchgekennzeich-S ^ _for maintenance and repair work ^ ^U _e ^ ^g _well-known ^{is ™ e} ^ _orstation set up in a mine (Conti Elektro Ber.chte, Juh / Sep- ^{T ans} ° ™ \ ° _die ι ^ _{HHfe e} , _p g _en

^^ Xf _of the behn-J «uniUu ^^ ^. Dry cooler w

£ ™ ^e ^ _{ters treks} and the pump _leading in either of Ab * J "next to the Le.tungen

Ξ. "" ¹ _f , _r arranged s.nd. .

Trjnsformjto ^^ _a Transformat _or , η

one of the claims, bis.bei

oval housing with bushings for cables and the lines leading to the oil cooler are arranged is, characterized in that the jacket (13) of the housing (130) made of glass fiber reinforced plastic and the base (132) as well as the cover (136), which is conductively connected to it, is made of metal.

^ istation according to claim characterized by that the bottom (132) of the housing (130) e.ne the lower edge of the Mantesl (131) receiving groove (133) and the spaces between the

The jacket and the groove flanks are sealed tightly s.nd ..

8. Station according to claim 6 or 7, characterized in that between the cover (36) and the upper edge of the jacket (131) e.n with this

tightly connected, metallic ring (134) and between this and the cover (136) e.n sealing ring (135) provided s.nd.

9. Station according to one of claims 1 to characterized in that the oil level, m Kettle (102) is lower than the upper edge of the The kettle and the space between the oil and the lid are filled with nitrogen.

50

_{"T the Aufga} be based on creating a ^ _Tr ^g _ansfo ^B _rma gate station de _{e Ford} met modified later, only e ne relatively kle.ne ur de _whether ⁶ _{erirdisch not} Ersche.nung

to be g ^ _{Transformators} n.ch

^ ^ _{maintenance free} , _st .

Jg ^, fJJ ,,,, _Drive the pump on, n open loosened aau _Dre h _s tromkurzsch uBlaufermo-

55 B ^auwei ^ ^u _h ^sg _{and in ö, unt} en disposed in the boiler or Vorges

is. _{formator itself} does not require any maintenance,

Since the 1 ra _then guarantees if that

Pumia unit maintenance-free isi. that is, a Lebens60 ^ P ^s "8 ^ f _{he eWa de} n ⁸ _{r Service life} of the Trans Ford Auer ^. , ^^ _{use e} .nes rotary

rom short-circuit runners in an open construction for jromKur _{wjrd achieved> that the}

den Antneb ^ W ^ ^^ _ß

6 ₅ Antnebsmo κ _{construction a similar lead} .

the ^ J ™ ^. _{the camp} . Since the ^! Temperature

^ _{rfes Kesse} , _{having the} least value, leads

the arrangement of the pump and the drive motor jnten in the boiler to further reduce the Temperature and thus a further increase in service life.

In order to keep the stress on the bearings as low as possible, it is advantageous to use the three-phase squirrel cage motor train with at least two Polpaarcn, so a relatively low speed dig.

Even further, the life of the bearings of the motor and the pump can be increased in that two roller bearings arranged one inside the other are provided on all bearing parts. Such camps make the Relative speed of the adjacent bearing rings compared to the relative speed of the outer and inner bearing ring halved. In addition, undisturbed operation is still possible, if one of the two nested roller bearings should fail and seize up.

In principle, it is possible to transfer the heat generated by the transformer to the To give up groundwater or the soil. However, it is more advantageous to connect the cooler to a heat requirement and with the heat it gives off, for example, sidewalks or streets, the lawn of a Sports grounds, swimming pools, switches, cable distribution cabinets, rooms in buildings or hot water generators to heat.

Since the freedom from maintenance makes it possible to have permanently available access to the pit do without, so the pit can be filled in again after the boiler has been inserted and thus not only does not appear above ground, but also no manhole cover or the like. What is required is particularly advantageous for security reasons, and also possibly using the above the station If the floor is located, it is important that the boiler or any housing that accommodates it is maintenance-free. If you make the boiler corrosion-resistant and give it such a high compressive strength that it can be inserted directly into the ground, then reach the pit and the cost of it one Minimum. On the lid of the boiler of such an embodiment, one with bushings for Cable and the lines leading to the oil cooler cover provided, in which the preferably designed for plug connections connecting devices of the transformer protrude. As a result, the connection devices and connections are also reliably protected. Reliable can be like that this cover can be filled with foam to protect it.

For two reasons, however, the use of a housing in which the boiler is usually used is used, be more advantageous.

On the one hand, the housing can serve as a trough in the event that oil should leak from the boiler. To the For others, a housing allows side access in the event of damage to the transformer this or a lifting without having to carry out extensive digging work, because even if the housing is completely in the ground, at most one access to its cover must be exposed.

A maintenance-free design of the housing accommodating the transformer is possible in various ways possible. For example, the housing can be made of concrete or stainless steel. Especially advantageous because of its relatively low cost and the ability to use prefabricated components to be able to, is a housing, its jacket made of glass fiber reinforced plastic and its bottom as well as the cover conductively connected to this are made of metal. The coat can in this case to be wrapped. A round or oval cross-sectional shape of the housing, which is also in terms of the Compressive strength is appropriate, is advantageous. The metallic base and the memHic lid ensure good grounding. If the bottom has a groove that receives the lower edge of the jacket possesses, as is the case in an advantageous embodiment, then prepares the sealing of the Housing at the transition from the jacket to the floor no difficulties if you consider the space between potted tightly to the jacket and the flanks of the groove. It is also advantageous / wipe the cover and the upper edge of the jacket with this tightly connected metallic ring, for example from Aluminum to be provided. This ring gives the upper edge of the jacket a high degree of strength and enables it also in a simple manner to close the housing with the lid tightly by placing between the Cover and the metallic ring provides a sealing ring.

In order not to have to provide a separate oil expansion tank, lie; in a preferred embodiment the oil level in the kettle is lower than the top of the kettle, and the space between the oil and the Lid is filled with nitrogen. The nitrogen forms the gas cushion for a change in the oil level.

Appropriately, an above-ground oil level indicator is provided so that from An oil level check can be carried out from time to time. Since a remote transmission of the oil level is easy isl possible, the 'display device can be attached to any be arranged in a suitable location.

It is also useful to have a protective device that works as a function of the oil level and / or the oil temperature to be provided with a warning signal generator so that if the oil level drops to a Leak in the boiler can be attributed to and / or to the rise in the oil temperature above a maximum Value, which can be attributed to a loss of oil, but also to damage to the transformer or the cooling system can, at least one warning signal is given. If one must assume that the error has not been eliminated before major damage occurs, it is advisable to equip the protective device with one of the Transformer in the event of an impermissible excess temperature on the secondary side disconnecting the switchgear from the mains to provide. Since as a rule the networks are meshed to such an extent that despite the failure of one Transformer the energy supply can be maintained in full, can thereby the transformer can be protected from major damage. Of course, the protective device r.'jch are trained in such a way that they do not only focus on the Glstand and the oil temperature responds, but also to the complete failure of the one driving the pump Motor or the failure of a phase. However, it is advisable to dimension the motor so that it can continue to run even in single-phase at least until the damage can be repaired. Further can also generate a warning signal if a bearing is completely seized up and / or the transformer be switched off.

Unless the oil cooler with a heat consumption!

is combined, in which a uniform and constant Heat consumption is not guaranteed, as is the case, for example, with a hot water generator or a room heating is the case, one can do one depending on the oil temperature and possibly the Heat demand controlled, at least effective when a specified oil temperature is exceeded Provide air cooling for the oil cooler. In order for this air cooling to work maintenance-free, it is advisable to train them as a cooling device with air movement through free convection. The air cooling can then in a simple manner effective or ineffective by means of a flap in the duct used for convection be made.

The invention is described in detail below with reference to an exemplary embodiment shown in the drawing explained. Show it:

F i g. I a longitudinal section through the exemplary embodiment in the installed state,

F i g. 2 shows a section along the line H-II of FIG. I,

3 shows a longitudinal section through the transformer of the embodiment,

4 shows a longitudinal section of the pump and of it driving electric motor,

Fi g. 5 shows a longitudinal section through an exemplary embodiment an oil cooler built into a boiler.

A transformer station for feeding electrical energy from a medium-voltage network into a Nicdcrspaniuingsnctz has an underfloor transformer, designated as a whole by 101, which has a smooth boiler 102 made of stainless steel, which is circular in cross section. The actual transformer 103 and a motor 104, which is designed as a three-phase short-circuit motor in an open design and is directly connected to the undervoltage circuit of the transformer 103, are located in this tank. To the motor 104 ·, ¹ centrifugal pump 105 is mounted, the rotating member is overhung on the motor shaft.

For the connection of the cables 107 of the Mitlclspannungsnet / .tcs and the not shown cables of the Niedcrspanniingsnetzes plug connections are provided, clic consist of an angled plug 109 sitting at the end of the cable and a plug 110 which is insulated on the lid of the boiler and is attached with a bushing from which a connection to the assigned transformer winding runs. The tight passages are necessary because the tank 102 is filled with oil so that the trunk former 103 is completely in the oil, and the space between the oil level and the cover is filled with nitrogen in order to have a separate oil drainage structure . to be able to do without. Two oil lines 112 are also tightly passed through the cover, one of which is connected to the pressure port of the pump (OS.

The oil lines 1 12 lead to an oil cooler which is arranged un a Würmebcdiirfsstellc, An embodiment of such an oil cooler is in F i g. 5 and explained below. The oil cooler is designed so that it is able to dissipate the waste heat generated in the door monitor 103 and in the motor 104 as long as the pump 105 is working, since the motor 104 is connected directly to the failure side of the transformer 103 and, like the pump, is maintenance-free is formed, the pump 105 keeps the oil circuit upright as long as the Tiiiiisfortnalof 101 is in operation.

The pump 105 and the motor 104 driving it are, as FIGS. 1 and 3 show, below the actual transformer 103 placed in the boiler so that it is in the oil with the lowest temperature located, which is advantageous in terms of service life. So that the oil from the pump 104 nevertheless is sucked in at the highest temperature and conveyed to the oil cooler, the Pump 105 connected to a suction pipe 121, which after

ίο is led up to close to the oil level. The oil from oil cooler returning to the boiler 112 'opens into one above the transformer 103 The greatest possible distance from the suction opening of the suction pipe 121.

The motor 104 has, as FIG. 4 shows, completely open end shields 122 so that the oil is in direct contact with it the stator 123 and the rotor 124 can come. The Moiorwcllc 125 is in both storage rails 122 mounted by means of two roller bearings 126 arranged one inside the other. As Figure 4 also shows, the Outer ring of the inner bearing as the inner ring of the outer bearing. This design of the roller bearings 126 becomes the relative movement of the inner ring with respect to the middle ring and this opposite the outer ring is reduced to half the speed of the motor 104, the one in the embodiment has a synchronous speed of 1000 revolutions per minute and is so dimensioned. that he too after Failure of a phase still applies a sufficiently large torque to drive the pump 105. If one of the two nested bearings should fail and block, the function ··· Ability of the motor 104 and the pump 105 not impaired.

Like F1 g. 4 shows the housing 127 of the centrifugal pump 105 together with the amount of skin a bearing plate 122 and the impeller stored 1 ¹ S overhung on the motor shaft 125th Therefore the centrifugal pump 105 is also maintenance-free.

The underfloor transformer 101 sees in the assembled state in a mil 130 designated as a whole Housing, which has a made of glass fiber reinforced Kunststoll, wound jacket 131, the one has a circular shape, but also for example

could be oval. The width of the jacket 131, which results in the height of the housing Hd, is chosen so that. ¹ there is enough space above transformer 103 for plugs 109 and 110.

The bottom 132 of the housing IK) is an in

The example of a cast metal plate, where a good earthing is guaranteed. On its upper side, the bottom 132 is provided with a groove 133 running along its outer edge, which accommodates the unier edge of the jacket 131 and, in its green color, is one of the strengths of the jacket The groove 133 widens towards the top. The space between the groove flanks and the casing is filled with plastic, which now creates a tight connection between the casing 131

the floor 132 increase. The upper edge of the jacket 13 engages in an outer seat of a metallic ring 1.1 'which, in the exemplary embodiment, consists of aluminum. The ring 134 is glued to the jacket 131 or wrapped around it and thereby tightly connected to the mimic. The upward-pointing Kingfillc de Ringes 134 is provided with a groove in which a ring seal 135 lies. This ring seal 1.15 seals the housing 130 on the upper part. where a lid I3i

made of metal is provided, which engages over the ring 134 which is attached to the upper edge of the jacket 131 gives the required mechanical strength. Cover 136 is conductive for the purpose of good grounding connected to the floor 132. Lugs 137 on the cover 5 136 facilitate handling of the cover.

The jacket 131 is provided with openings 138 at diametrical points on the leadthroughs 139 are aligned, which are also made of glass fiber reinforced plastic and on the outside of the jacket 131 are put on. In the exemplary embodiment, they are glued to the jacket, but they could also be used in others Wise to be associated with him. The cables 107 of the medium-voltage network, the cables 107 'of the low-voltage network and the oil lines 112 and 112' are routed (FIG. 2).

As FIG. I shows, the cover 136 of the housing is located 130 in the ground, so that the station does not appear to the outside. Provided there is access to the transformer 103, to the motor 104 or to the centrifugal pump 105 should be required, but because of the If these units are unlikely to be maintenance-free, then only the cover 136 needs to be exposed. The underfloor transformer 101 can then be lifted out of the housing if necessary. Kiη further The advantage of the housing 130 is that it can serve nls oil pan in the event that oil from the Boiler 102 should shut down.

In the exemplary embodiment, the oil lines 112 lead and 112 'to the oil cooler 140 shown in FIG. 5, which is installed in a boiler designated as a whole as 141. The boiler has one in one Insulated housing 142 arranged boiler 143, in which the water to be heated is located. For the The water supply is a supply line 145 introduced in the lower area of the boiler for water withdrawal a linear graduation 146 arranged in the upper area of the boiler "" is provided. The oil cooler 140 is designed in the form of a pipe coil, which is located in the interior of the boiler.

The boiler 141 is designed so that one of its Rated power corresponding Wanmvaxxereni nahine

.15

4 ° the output of the oil cooler 140 is sufficient to heat the water to the temperature setpoint.

On the other hand, sufficient heat dissipation from the oil cooler 140 and thus sufficient cooling of the oil even if there is less or none at all from the boiler for some time warm water is taken, the boiler is on its outside with radially protruding cooling fins 144 are provided, which extend up to close to the inner wall of the housing 142. Furthermore, on the housing 142 an air inlet opening 147 at the bottom and a tubular air outlet opening 148 at the top so that Cool air enter through the air inlet opening 147 as a result of free convection, then into the of the Cooling fins 144 formed channels rise up and there through the air outlet opening 148 of the housing 142 can exit again. The ribs 144 are dimensioned so that without hot water removal the total heat loss of the transformer 103 and the electric motor 104 via the oil cooler 140, the Boiler water and the ribs 144 are released to the cooling air at a still permissible oil temperature can.

A thermostat 149 is provided so that heat is only given off via the cooling fins 144 when necessary provided, whose heat sensor determines the water temperature and thus indirectly also the oil temperature. The thermostat 149 controls one in the LuftauskilJöff-IHing 148 arranged air flap 150 so that this air flap the air outlet opening 148 completely closes when the water temperature is below the set value, and the air flap 150 im required measure opens when the water temperature exceeds the set point.

! line protective device, not shown, with a Warning signal generator and a switching device eiveugi a warning signal and disconnects the transformer K) J from low voltage when the oil level in the boiler lOi oiler falls short of a value when there Oil temperature even when the air cooling is switched on de Boilers 141 exceed the maximum allowable limit should.

For this purpose 4 blult drawings

Claims (1)

Patent claims: The invention
gate station ^m Ji an underground transformer _{etztransforinatori de,. himself) n} Boiler is located and one